[FFmpeg-devel] [PATCH] configure: fix static library suffix for MSVC builds

[FFmpeg-devel] [PATCH] configure: fix static library suffix for MSVC builds

[Practice2001 via ffmpeg-devel]

MSVC static builds currently always use ".a" for static library suffixes
(e.g. libavcodec.a, libavformat.a). This causes failures when linking
with Visual Studio, which expects ".lib" static libraries.

This patch adjusts configure so that when --toolchain=msvc is used,
LIBSUF is correctly set to ".lib" instead of the Unix default ".a".

This fixes linking with MSVC and Visual Studio-based build systems.

---

Environment:
 - Windows 10
 - MSYS2 (mingw64)
 - Visual Studio 2019 / 2022
 - NASM installed
 - MSVC toolchain selected

Commands:

    ./configure --toolchain=msvc --enable-static --disable-shared
    make

Resulting static libraries incorrectly have ".a" suffix, e.g.:

    libavcodec.a
    libavformat.a
    libavutil.a

Linking test program with MSVC:

    cl test_ffmpeg.c /I C:\ffmpeg-test-install\include ^
        /link /LIBPATH:C:\ffmpeg-test-install\lib avcodec.lib avformat.lib avutil.lib

Error:

    LINK : fatal error LNK1181: cannot open input file 'avcodec.lib'

---

Verification of the fix:

After applying this patch and rebuilding:

Generated static libraries:

    avcodec.lib
    avformat.lib
    avutil.lib

Test program build script (build_test.bat):

    cl test_ffmpeg.c ^
        /I C:\ffmpeg-test-install\include ^
        /link /LIBPATH:C:\ffmpeg-test-install\lib ^
        avcodec.lib avformat.lib avutil.lib

Output:
	D:\ffmpeg\temp>.\buid_test.bat
	Microsoft (R) C/C++ Optimizing Compiler Version 19.50.35718 for x64
	Copyright (C) Microsoft Corporation.  All rights reserved.

	test_ffmpeg.c
	Microsoft (R) Incremental Linker Version 14.50.35718.0
	Copyright (C) Microsoft Corporation.  All rights reserved.

	/out:test_ffmpeg.exe
	/LIBPATH:C:\ffmpeg-test-install\lib
	avcodec.lib
	avformat.lib
	avutil.lib
	/OUT:test.exe
	test_ffmpeg.obj

	=== BUILD SUCCESS ===
	Running test...
	FFmpeg avcodec version: 4068196
	FFmpeg avformat version: 4064871
	FFmpeg avutil version: 3936868

This confirms MSVC accepts the .lib suffix and the libraries function
correctly.

---
 configure | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/configure b/configure
index 47f9b31439..596d66ce53 100755
--- a/configure
+++ b/configure
@@ -6067,7 +6067,7 @@ case $target_os in
     win32|win64)
         disable symver
         LIBPREF=""
-		LIBSUF=".lib"
+        LIBSUF=".lib"
         if enabled shared; then
             # Cannot build both shared and static libs with MSVC or icl.
             disable static
-- 
2.34.1

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[FFmpeg-devel] Re: [PATCH] configure: fix static library suffix for MSVC builds

[Daniel Verkamp via ffmpeg-devel]

On Sat, Nov 22, 2025 at 3:51 PM Practice2001 via ffmpeg-devel
<ffmpeg-devel@ffmpeg.org> wrote:
> MSVC static builds currently always use ".a" for static library suffixes
> (e.g. libavcodec.a, libavformat.a). This causes failures when linking
> with Visual Studio, which expects ".lib" static libraries.
>
> This patch adjusts configure so that when --toolchain=msvc is used,
> LIBSUF is correctly set to ".lib" instead of the Unix default ".a".
>
> This fixes linking with MSVC and Visual Studio-based build systems.
>
[...]

Hi,

This appears to have been fixed by commit 8eca3fa619a7 ("configure:
use proper Windows-style static library naming"), and then re-shuffled
in commit 671e54d7151b ("configure: add -static suffix to internal
static libs for test programs").

> ---
>  configure | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/configure b/configure
> index 47f9b31439..596d66ce53 100755
> --- a/configure
> +++ b/configure
> @@ -6067,7 +6067,7 @@ case $target_os in
>      win32|win64)
>          disable symver
>          LIBPREF=""
> -               LIBSUF=".lib"
> +        LIBSUF=".lib"

Not really important, but I'm curious what happened here - the
original doesn't match what was in the repository, even before the
commits above.

Thanks,
-- Daniel
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[FFmpeg-devel] Re: [PATCH] configure: fix static library suffix for MSVC builds

[Discord Account via ffmpeg-devel]

Yeah, I just checked, it's patched. Additionally, I tested a bash script I
wrote for the configuration, and it produces files with the '.lib'
extension. So, this patch is unnecessary. Thanks for pointing it out and
referencing previous commits. It's just that it was listed in the bug
tracker under 'open' status.

configuration:
./configure \
    --toolchain=msvc \
    --enable-static \
    --disable-shared \
    --disable-programs \
    --disable-doc \
    --disable-swscale \
    --disable-swresample \
    --disable-postproc \
    --disable-avfilter \
    --disable-avdevice \
    --disable-network \
    --disable-autodetect \
    --disable-d3d12va \
    --disable-d3d11va \
    --disable-dxva2 \
    --disable-everything \
    --enable-decoder=rawvideo \
    --prefix=/c/ffmpeg-test-install

buid_test.bat:
@echo off
set FFMPEG=C:\ffmpeg-test-install

cl.exe /I"%FFMPEG%\include" test_ffmpeg.c ^
    /link /LIBPATH:"%FFMPEG%\lib" ^
    avcodec.lib avformat.lib avutil.lib ^
    /OUT:test.exe

if %ERRORLEVEL% EQU 0 (
    echo.
    echo === BUILD SUCCESS ===
    echo Running test...
    test.exe
) else (
    echo.
    echo === BUILD FAILED ===
)

Output:
D:\ffmpeg\temp>.\buid_test.bat
Microsoft (R) C/C++ Optimizing Compiler Version 19.50.35718 for x64
Copyright (C) Microsoft Corporation.  All rights reserved.

test_ffmpeg.c
Microsoft (R) Incremental Linker Version 14.50.35718.0
Copyright (C) Microsoft Corporation.  All rights reserved.

/out:test_ffmpeg.exe
/LIBPATH:C:\ffmpeg-test-install\lib
avcodec.lib
avformat.lib
avutil.lib
/OUT:test.exe
test_ffmpeg.obj

=== BUILD SUCCESS ===
Running test...
FFmpeg avcodec version: 4068196
FFmpeg avformat version: 4064871
FFmpeg avutil version: 3937124



On Tue, Nov 25, 2025 at 11:14 AM Daniel Verkamp <daniel@drv.nu> wrote:

> On Sat, Nov 22, 2025 at 3:51 PM Practice2001 via ffmpeg-devel
> <ffmpeg-devel@ffmpeg.org> wrote:
> > MSVC static builds currently always use ".a" for static library suffixes
> > (e.g. libavcodec.a, libavformat.a). This causes failures when linking
> > with Visual Studio, which expects ".lib" static libraries.
> >
> > This patch adjusts configure so that when --toolchain=msvc is used,
> > LIBSUF is correctly set to ".lib" instead of the Unix default ".a".
> >
> > This fixes linking with MSVC and Visual Studio-based build systems.
> >
> [...]
>
> Hi,
>
> This appears to have been fixed by commit 8eca3fa619a7 ("configure:
> use proper Windows-style static library naming"), and then re-shuffled
> in commit 671e54d7151b ("configure: add -static suffix to internal
> static libs for test programs").
>
> > ---
> >  configure | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/configure b/configure
> > index 47f9b31439..596d66ce53 100755
> > --- a/configure
> > +++ b/configure
> > @@ -6067,7 +6067,7 @@ case $target_os in
> >      win32|win64)
> >          disable symver
> >          LIBPREF=""
> > -               LIBSUF=".lib"
> > +        LIBSUF=".lib"
>
> Not really important, but I'm curious what happened here - the
> original doesn't match what was in the repository, even before the
> commits above.
>
> Thanks,
> -- Daniel
>
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