Commit Graph

1 Commits

Author SHA1 Message Date
Werner Lemberg 602be7c810 [gzip] Improve building with external zlib (#49673).
Building FreeType with external zlib 1.2.8 makes msvc 14 stop with
the following error.

  ftgzip.c
  zlib-1.2.8\zlib.h(86): error C2061:
                         syntax error: identifier 'z_const'
  zlib-1.2.8\zlib.h(94): error C2054:
                         expected '(' to follow 'z_const'
  zlib-1.2.8\zlib.h(94): error C2085:
                         'msg': not in formal parameter list
  ...
  zlib-1.2.8\zlib.h(877): fatal error C1003:
                          error count exceeds 100; stopping compilation

The error happens because FreeType keeps an own copy of zlib-1.1.4
under `src/gzip'.  When building `src/gzip/ftgzip.c' with
FT_CONFIG_OPTION_SYSTEM_ZLIB defined, it uses

  #include <zlib.h>

which correctly finds an external `zlib.h', but `zlib.h' itself has
a line

  #include "zconf.h"

which makes Visual Studio 2015 find `src/gzip/zconf.h' while
compiling the files in `src/gzip'.

* src/gzip/zconf.h: Rename to...
* src/gzip/ftzconf.h: ... this.
* src/gzip/zlib.h, src/gzip/rules.mk (GZIP_DRV_SRCS): Updated.
2016-12-01 11:36:37 +01:00