cmake: build manual pages (including curl.1)

Also make Perl mandatory to allow building the docs.

While CMakeLists.txt could probably read the list of manual pages from
Makefile.am, actually putting those in CMakeLists.txt is cleaner so that
is what is done here.

Fixes #1230
Ref: https://github.com/curl/curl/pull/1288

4 files changed, 24 insertions, 6 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 8390c38c9..58d159e2c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -224,6 +224,8 @@ if(ENABLE_MANUAL)
     message(WARNING "Found no *nroff program")
   endif()
 endif()
+# Required for building manual, docs, tests
+find_package(Perl REQUIRED)
 
 # We need ansi c-flags, especially on HP
 set(CMAKE_C_FLAGS "${CMAKE_ANSI_CFLAGS} ${CMAKE_C_FLAGS}")
@@ -1082,6 +1084,7 @@ function(TRANSFORM_MAKEFILE_INC INPUT_FILE OUTPUT_FILE)
 
 endfunction()
 
+add_subdirectory(docs)
 add_subdirectory(lib)
 if(BUILD_CURL_EXE)
   add_subdirectory(src)
diff --git a/docs/CMakeLists.txt b/docs/CMakeLists.txt
new file mode 100644
index 000000000..4b111b85a
--- /dev/null
+++ b/docs/CMakeLists.txt
@@ -0,0 +1,3 @@
+#add_subdirectory(examples)
+#add_subdirectory(libcurl)
+add_subdirectory(cmdline-opts)
diff --git a/docs/cmdline-opts/CMakeLists.txt b/docs/cmdline-opts/CMakeLists.txt
new file mode 100644
index 000000000..ccee4a142
--- /dev/null
+++ b/docs/cmdline-opts/CMakeLists.txt
@@ -0,0 +1,12 @@
+set(MANPAGE "${CMAKE_BINARY_DIR}/docs/curl.1")
+
+# Load DPAGES and OTHERPAGES from shared file
+transform_makefile_inc("Makefile.inc" "${CMAKE_CURRENT_BINARY_DIR}/Makefile.inc.cmake")
+include("${CMAKE_CURRENT_BINARY_DIR}/Makefile.inc.cmake")
+
+add_custom_command(OUTPUT "${MANPAGE}"
+  COMMAND "${PERL_EXECUTABLE}" "${CMAKE_CURRENT_SOURCE_DIR}/gen.pl" mainpage "${CMAKE_CURRENT_SOURCE_DIR}" > "${MANPAGE}"
+  DEPENDS "${DPAGES}" "${OTHERPAGES}"
+  VERBATIM
+)
+add_custom_target(generate-curl.1 DEPENDS "${MANPAGE}")
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 9bbeb6054..e6004ceae 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -1,7 +1,6 @@
 set(EXE_NAME curl)
 
 if(USE_MANUAL)
-  find_package(Perl REQUIRED)
   # Use the C locale to ensure that only ASCII characters appear in the
   # embedded text. NROFF and MANOPT are set in the parent CMakeLists.txt
   add_custom_command(
@@ -9,18 +8,19 @@ if(USE_MANUAL)
     COMMAND ${CMAKE_COMMAND} -E echo "#include \"tool_setup.h\"" > tool_hugehelp.c
     COMMAND ${CMAKE_COMMAND} -E echo "#ifndef HAVE_LIBZ" >> tool_hugehelp.c
     COMMAND env LC_ALL=C "${NROFF}" ${NROFF_MANOPT}
-            "${CURL_SOURCE_DIR}/docs/curl.1" |
-            "${PERL}" "${CMAKE_CURRENT_SOURCE_DIR}/mkhelp.pl"
+            "${CURL_BINARY_DIR}/docs/curl.1" |
+            "${PERL_EXECUTABLE}" "${CMAKE_CURRENT_SOURCE_DIR}/mkhelp.pl"
             "${CURL_SOURCE_DIR}/docs/MANUAL" >> tool_hugehelp.c
     COMMAND ${CMAKE_COMMAND} -E echo "#else" >> tool_hugehelp.c
     COMMAND env LC_ALL=C "${NROFF}" ${NROFF_MANOPT}
-            "${CURL_SOURCE_DIR}/docs/curl.1" |
-            "${PERL}" "${CMAKE_CURRENT_SOURCE_DIR}/mkhelp.pl" -c
+            "${CURL_BINARY_DIR}/docs/curl.1" |
+            "${PERL_EXECUTABLE}" "${CMAKE_CURRENT_SOURCE_DIR}/mkhelp.pl" -c
             "${CURL_SOURCE_DIR}/docs/MANUAL" >> tool_hugehelp.c
     COMMAND ${CMAKE_COMMAND} -E echo "#endif /* HAVE_LIBZ */" >> tool_hugehelp.c
     DEPENDS
       "${CURL_SOURCE_DIR}/docs/MANUAL"
-      "${CURL_SOURCE_DIR}/docs/curl.1"
+      generate-curl.1
+      "${CURL_BINARY_DIR}/docs/curl.1"
       "${CMAKE_CURRENT_SOURCE_DIR}/mkhelp.pl"
       "${CMAKE_CURRENT_SOURCE_DIR}/tool_hugehelp.h"
     VERBATIM)