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mingw: fix CPU reporting in `git version --build-options`

We cannot rely on `uname -m` in Git for Windows' SDK to tell us what
architecture we are compiling for, as we can compile both 32-bit and
64-bit `git.exe` from a 64-bit SDK, but the `uname -m` in that SDK will
always report `x86_64`.

So let's go back to our original design. And make it explicitly

Signed-off-by: Johannes Schindelin <>
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dscho committed Nov 23, 2018
1 parent eca28c6 commit c6ce1b9b6a38841660311a0151c4520a1a40e0a6
Showing with 19 additions and 0 deletions.
  1. +19 −0 compat/mingw.h
@@ -6,6 +6,25 @@ typedef _sigset_t sigset_t;
#include <winsock2.h>
#include <ws2tcpip.h>

* In Git for Windows, we cannot rely on `uname -m` to report the correct
* architecture: /usr/bin/uname.exe will report the architecture with which the
* current MSYS2 runtime was built, not the architecture for which we are
* currently compiling (both 32-bit and 64-bit `git.exe` is built in the 64-bit
* Git for Windows SDK).
/* This was figured out by looking at `cpp -dM </dev/null`'s output */
#if defined(__x86_64__)
#define GIT_HOST_CPU "x86_64"
#elif defined(__i686__)
#define GIT_HOST_CPU "i686"
#error "Unknown architecture"

/* MinGW-w64 reports to have flockfile, but it does not actually have it. */

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