Hi, I'm currently trying to build openjdk11 from on my Windows 7 with VS2017 installed. I discovered the issue which cause "bash configure" to fail.
+ configure: The C compiler (located as /cygdrive/c/progra~2/mib055~1/2017/commun~1/vc/tools/msvc/1414~1.264/bin/hostx86/x64/cl) does not seem to be the required microsoft compiler. + configure: error: A microsoft compiler is required. Try setting --with-tools-dir. + configure: The result from running it was: "▒▒?▒▒▒▒▒▒? ▒▒▒▒▒▒▒▒▒▒ Microsoft (R) C/C++ ▒▒▒? 19.14.26433 ▒▒▒ x64" + configure exiting with result code 1 I think the problem is that configuration relies on en-US locale output. It is actually valid, but cannot be parsed because my Windows installation uses ru-RU locale by default. Latest cl.exe returns the following line: + Оптимизирующий компилятор Microsoft (R) C/C++ версии 19.14.26433 для x64 I think that would be a problem for anyone who doesn't use en-US locale. I managed to avoid this issue by replacing line 434 in make/autoconf/toolchain.m4: + $ECHO "$COMPILER_VERSION_OUTPUT" | $GREP "Microsoft.*C/C++" > /dev/null But still, COMPILER_VERSION_NUMBER is not parsed properly and configure prints a warning: + WARNING: You are using microsoft older than 16.00.30319.01. This is not a supported configuration. After that compilation ran smoothly.