[FFmpeg-cvslog] configure: fix Microsoft tools detection

[Kacper Michajłow]

ffmpeg | branch: master | Kacper Michajłow <kasper93 at gmail.com> | Sat Jun 14 03:03:15 2025 +0200| [53da090ab7bfa6a5c7ed65bfd4339ba0e3dd6a67] | committer: Martin Storsjö

configure: fix Microsoft tools detection

LLVM tools print installation path upon execution. If one uses LLVM
tools bundled with Microsoft Visual Studio installation, they would be
incorrectly detected as Microsoft's ones.

Microsoft tools can have localized names, so a more specific string
check is not feasible, but luckily we can test if "Microsoft" is at the
beginning of the line, as it is always the case.

Signed-off-by: Kacper Michajłow <kasper93 at gmail.com>
Signed-off-by: Martin Storsjö <martin at martin.st>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=53da090ab7bfa6a5c7ed65bfd4339ba0e3dd6a67
---

 configure | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/configure b/configure
index 2d312e739c..61ef0e2586 100755
--- a/configure
+++ b/configure
@@ -5127,9 +5127,9 @@ probe_cc(){
         _flags_filter=msvc_flags
         _ld_lib='lib%.a'
         _ld_path='-libpath:'
-    elif $_cc -nologo- 2>&1 | grep -q Microsoft || { $_cc -v 2>&1 | grep -q clang && $_cc -? > /dev/null 2>&1; }; then
+    elif $_cc -nologo- 2>&1 | grep -q ^Microsoft || { $_cc -v 2>&1 | grep -q clang && $_cc -? > /dev/null 2>&1; }; then
         _type=msvc
-        if $_cc -nologo- 2>&1 | grep -q Microsoft; then
+        if $_cc -nologo- 2>&1 | grep -q ^Microsoft; then
             _ident=$($_cc 2>&1 | head -n1 | tr -d '\r')
         else
             _ident=$($_cc --version 2>/dev/null | head -n1 | tr -d '\r')
@@ -5239,7 +5239,7 @@ if [ -z "$CC_DEPFLAGS" ] && [ "$dep_cc" != "$cc" ]; then
     DEPCCFLAGS=$_flags
 fi
 
-if $ar 2>&1 | grep -q Microsoft; then
+if $ar 2>&1 | grep -q ^Microsoft; then
     arflags="-nologo"
     ar_o='-out:$@'
 elif $ar 2>&1 | grep -q "\[D\] "; then